Yellow wool-dye.



'many, have invented new and useful Im- UNITED STATES PAIENT OFFICE.

AUGUST LEOPOLD LASKA, OF OFFE'NBAOH ON-'lHE-'i\ IAIN, GERMANY, ASSIGN OR TO CHEMISOHE FABRIK GRIESIIEIM-ELEKTRON, OF Flt-lNKFORT-ON-THEMAIN, GEIMAN Y, A CORPORATION. i

YELLOW WOOL-DYE.

zsrcrfeaeeo.

Be it known that I, AUGUs'r IJEOPOLD LASKA dOCtOI of philosophy, chemist, and a resident of 5 Gerberstrasse, Offenbach-onthe-Main, in the Grand Duchy of Hesse, Gerprovements in Yellow Wool Dyestuffs, of which the following is a specification.

My invention relates to the production of yellow wool dyestuffs by combining paratoluidin meta-sulfonic acid (CII,.NII,,.SO,H= 1.4.3) with pyrazoion derivatives of the general formula: I

coon

C: on. N- car... X, l

wherein X means a hydrogen atom or a who group. Thedyestull's thus obtained are of excellent fastness to light, surpassing in this point the dyestuffs obtained from isomeric acids. i

The following example will show how this new colo'ring matter can be produced. The parts, are by weight.

Example: 37.4 parts of paratoluidin metasulfonic acid and 11.3 parts of calcinated sodium carbonate are dissolved in one hun dred and fifty parts of water. The solution is cooled down to 15 centigrade by addition of ice and diazotized with 13.8 parts of sodium nitrite and fifty-seven parts of hydrof chloric acid, 20 Baum. The solution of the diazo compound is poured into a solution oiii 66.8 parts of 1 parasulfophenyl-5-pyrazoloni 3-carbonic acid in about live hundred parts i of water and the sufficient q uantit y ot sodium 5 carbonate. After combining is completed i Specification of Letters Patent.

Application filed November 6, 1906.

Patented April 9, 1907.

Serial No. 342,174. (Specimens) the mixture is heated up to 70 centigrade and the dyestufl' precipitated by addition ,of a mineral acid and common salt, filtered, pressed, and dried in the usual manner. It

dyes wool from acid-bath lemon-yellow rivatives of the general formula:

. wherein X means a hydrogen atom or a sulfo group. t a

2. As a new article of manufacture the yellow wool dyestuffs, obtained by combining the diazotized paratoluidin meta-sulfonic acid (OII,.NH,.SO,,II 1.4.3) with pyrazolon derivatives of the general formula:

COOH.O H ON .C,,H X, wherein X means a hydrogen atom or a sulfo ,.SO,II 1.4.3) with pyrazolon degroup, forming yellow powders, dissolving in concentrated sulfuric acid to an orange solution, in water to a'yellow one, which is hardly altered by the addition of caustic-soda lye or hydrochloric acid.

Intestimony that I claim the foregoing as my invention I have signed my name, in resence of two witnesses, this 23d day of ctober, 1906.

AUGUST LEOPOLD LASKA.

Witnesses:

EVA SATTLER, OSKAR S'rANDHARn'r. 

